Porous Materials

Abstract

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Pore Structure and Permeation Properties of Kaolin-Silica-Alumina Ceramics

“…Tortuosity (t) is dened as the ratio of penetrating porosity to open porosity (e): 1) te e e |1 (10) Figure 11 indicates that the tortuosity of the 0.8mm Al 2 O 3 powder does not signicantly change for samples assin Journal of the Ceramic Society of Japan 111mWnB @ @ C 1573 K. The advantages of porous ceramic lters with a predominant mullite phase are that they have high uid per meability, narrow pore size distribution and good thermal stability. From Figs.…”

“…The decline in ux or permeation rate is believed to be the major limitation to the widespread implementation of crossow ltration in the wastewater treatment industry. 1) The uid permeability of porous materials depends on open porosity, pore size and the tor tuosity of pore networks. With a higher open porosity and a narrower pore size distribution, a lter shows higher liquid permeability and separation eciency.…”

Improvement of porous silicon carbide filters by growth of silicon carbide nanowires using a modified carbothermal reduction process

“…Porous materials used in filters and carriers for catalysts in diesel exhaust systems or in the coal-gasification-generation process require a high fraction of surface area in order to limit the emission of corrosive and toxic particles into the environment by the interaction between the hazardous particles and the coated-catalysts on the porous substrate [2,3]. However, the strength of porous materials with high specific area is generally not satisfactory, thus their low mechanical strength must be compensated by increasing the dimension of products for industrial application.…”

Assessment of Investment Process for Producing Copper Hollow Spheres

“…It is regarded that cellular materials produced by building up hollow spheres give predictable macroscopic properties, compared with those by foaming processes. [1][2][3][4][5] To date, hollow metallic spheres have been produced usually via the coaxial nozzle process using oxide slurry. 6,7) Compared with the conventional coaxial nozzle process, this paper demonstrates the feasibility of investment process in producing hollow spheres from copper alloys.…”